Quantum two-level systems and gravitational waves
Sign Up to like & getrecommendations! Published in 2024 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-025-03385-2
Abstract: We study the interaction between gravitational waves and a quantum two-level system consisting of a spin 1/2 particle using the formalism of the proper detector frame. This approach highlights the effects of gravitational waves on… read more here.
Keywords: two level; waves quantum; gravitational waves; level systems ... See more keywords
Super-quantum states in SU(2) invariant 3 × N level systems
Sign Up to like & getrecommendations! Published in 2017 at "Annals of Physics"
DOI: 10.1016/j.aop.2016.12.006
Abstract: Abstract Nonclassicality of quantum states is expressed in many shades, one of the most stringent of them being a new standard introduced recently in Bharath and Ravishankar (2014), by expanding the notion of local hidden… read more here.
Keywords: super quantum; quantum states; invariant level; level systems ... See more keywords
Studying Multi-Level Systems with Cross-Level Data: Introducing Three Integrated Datasets
Sign Up to like & getrecommendations! Published in 2025 at "British Journal of Political Science"
DOI: 10.1017/s0007123424000553
Abstract: Abstract Most political systems consist of multiple layers. Yet datasets are predominantly situated at a single territorial tier, encouraging methodological nationalism, regionalism, and localism. We present three new integrated datasets that include electoral, institutional, ideological,… read more here.
Keywords: multi level; integrated datasets; cross level; level ... See more keywords
Sub-kelvin thermometer for on-chip measurements of microwave devices utilizing two-level systems in superconducting microresonators
Sign Up to like & getrecommendations! Published in 2020 at "Applied Physics Letters"
DOI: 10.1063/5.0029351
Abstract: We present a superconducting microresonator thermometer based on two-level systems (TLSs), which is drop-in compatible with cryogenic microwave systems. The operational temperature range is 50–1000 mK (which may be extended to 5 mK), and the… read more here.
Keywords: two level; thermometer; level systems; cryogenic microwave ... See more keywords
Conditions for time-independence of N-level systems under the rotating wave approximation (RWA) and dipole selection rules
Sign Up to like & getrecommendations! Published in 2025 at "Journal of Modern Optics"
DOI: 10.1080/09500340.2025.2578291
Abstract: We analyze the time-dependence of N-level systems under the Rotating Wave Approximation and dipole selection rules. Such systems can be solved straightforwardly if the Hamiltonian can be transformed into a time-independent form. The conditions under… read more here.
Keywords: time independence; time; systems rotating; level ... See more keywords
Nonuniversality and strongly interacting two-level systems in glasses at low temperatures
Sign Up to like & getrecommendations! Published in 2018 at "New Journal of Physics"
DOI: 10.1088/1367-2630/aac930
Abstract: Recent experimental results showing untypical nonlinear absorption and marked deviations from well known universality in the low temperature acoustic and dielectric losses in amorphous solids prove the need for improving the understanding of the nature… read more here.
Keywords: two level; nonuniversality strongly; interacting two; level systems ... See more keywords
Two-level systems with periodic N -step driving fields: Exact dynamics and quantum state manipulations
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review A"
DOI: 10.1103/physreva.104.053101
Abstract: Zhi-Cheng Shi,1,2 Ye-Hong Chen ,3 Wei Qin,3 Yan Xia,1,2,* X. X. Yi ,4,† Shi-Biao Zheng,1,2 and Franco Nori 3,5 1Fujian Key Laboratory of Quantum Information and Quantum Optics (Fuzhou University), Fuzhou 350108, China 2Department of… read more here.
Keywords: physics; two level; systems periodic; level systems ... See more keywords
Efficient entanglement purification protocols for d -level systems
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review A"
DOI: 10.1103/physreva.98.042309
Abstract: We introduce entanglement purification protocols for d-level systems (qudits) with improved efficiency as compared to previous protocols. While we focus on protocols for bipartite systems, we also propose generalizations to multi-partite qudit systems. The schemes… read more here.
Keywords: level systems; entanglement purification; efficient entanglement; purification protocols ... See more keywords
Properties of two-level systems in current-carrying superconductors
Sign Up to like & getrecommendations! Published in 2025 at "Physical Review B"
DOI: 10.1103/physrevb.111.l180502
Abstract: We show that in disordered superconductors, at sufficiently low frequencies $\omega$, the coupling of TLS to external ac electric fields increases dramatically in the presence of a dc supercurrent. This giant enhancement manifests in all… read more here.
Keywords: two level; current carrying; carrying superconductors; level systems ... See more keywords
Atomistic study of two-level systems in amorphous silica
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review B"
DOI: 10.1103/physrevb.97.014201
Abstract: Internal friction is analyzed in an atomic-scale model of amorphous silica. The potential energy landscape of more than 100 glasses is explored to identify a sample of about 700 two-level systems (TLSs). We discuss the… read more here.
Keywords: two level; level systems; study two; amorphous silica ... See more keywords
Depletion of Two-Level Systems in Ultrastable Computer-Generated Glasses.
Sign Up to like & getrecommendations! Published in 2020 at "Physical review letters"
DOI: 10.1103/physrevlett.124.225901
Abstract: Amorphous solids exhibit quasiuniversal low temperature anomalies whose origin has been ascribed to localized tunneling defects. Using an advanced Monte Carlo procedure, we create in silico glasses spanning from hyperquenched to ultrastable glasses. Using a multidimensional path-finding… read more here.
Keywords: tunneling defects; two level; level systems; systems ultrastable ... See more keywords